Burner control apparatus



Sept 2U, 1950 R. B. MATTHEWS 2,953,197

BURNER CONTROL APPARATUS Fiied March 26, 195e s sheets-sheet 1 Il l mi lll IN V EN TOR.

Sept 20, 1960 R. B. MATTHEWS 2,953,197

BURNER CONTROL APPARATUS Filed March 26, 195e 3 Sheets-Sheet 2 INVENTOR.

agi/Lf. CAM

. @ARS Sept. 20, 1960 R. B. MATTHEWS 2,953,197

BURNER CONTROL APPARATUS Filed March 25, 1956 3 Sheets-Sheet 3 INVENTOR.

United States Patent YO BURNER CONTROL APPARATUS Russell B. Matthews, Wauwatosa, Wis., assignor to Baso Inc., Milwaukee, Wis., a corporation of Wiscousin Filed Mar. 26, 1956, Ser. No. 573,830

18 Claims. (Cl. 158-131) 'Ihis invention relates to burner control apparatus.

While the invention is not necessarily limited thereto, its principal field of utility is in connection with gas burning cooking ranges of the type in which one of the burners, such as the oven burner, is radapted to be placed under automatic time control, but wherein a safety shutolf feature is associated with this burner so that it cannot possibly receive gas if the pilot light associated with the burner is extinguished.

The invention enables a single control device to be employed for controlling the fuel flow, which is responsive to time controlled means and also responsive to safety shut-off means. The automatic timing mechanism can be of the same general type as now commonly ernployed in time switches for ranges comprising the usual synchronous motor driven clock and the adjustable controls associated therewith which are adapted to be set by the housewife automatically to effect the starting and stopping of the cooking operation at preselected times.

The automatic timing mechanism is preferably arranged to actuate a control valve through a mechanical .connection, which maybe selectively engaged and disengaged by suitable setting means for automatic or manual operation respectively.

One of the main objects of the present invention is the provision in the device of the general character above set forth of improved means for resetting or cocking the device so that with one unitary reset means the safety shut-off means may be -actuated to a holding relation with the holding means and the control valve may be put under the control of latching means which is in turn controlled by timing means.

Another object of the invention is to provide a device as above described wherein a single flow control means is operable to interrupt the flow of uid fuel to the burner during the reset operation of the safety shut-off means said single llow control means also being operable to move between flow-permitting and How-preventing positions under the control of time controlled means.

Another object of the invention is to provide improved thermoelectric safety shut-olf and automatic timing device n of relatively simple and inexpensive construction which are in one unitary housing. Y

While the particular structural features for obtaining a device of the character set forth are important features the more speciflc'aspects of the invention, it is to be understood that the precise feature shown and described may be varied within the broader aspects of the invention.

In order to acquaint those skilled in the art with the manner of construction and operating a device in accordance with the present invention, the invention will now be described in connection with the accompanying drawings in which:

Figure l is a fragmentary sectional view of one embodiment of the invention disposed in a fuel supply line 2,953,197 p Patented Sept. 2,0, 1960 to a burner, portions of the system being shown somewhat semi-diagrammatically;

Figure 2 is a sectional view along lines 2 2 of Figure l;

Figure 3 is a sectional view along lines 3-3 of Figure l;

Figure 4 is an enlarged fragmentary perspective view of the device shown in Figures 1-3, the parts being shown with starting knob 66 being lifted for rotation relative to button 60;

Figure 5 is an enlarged fragmentary perspective View of the device depicted in Figures l-3 with the cam 64, extension 64a, and knob 66 removed to better show the cooperation of the remaining parts; and

Figure 6 is yan enlarged fragmentary perspective view similar to Figure 5, with cam 64, extension 64a and knob 66 shown in operative relation to cam 63.

The invention can be embodied in a wide variety of forms for use with a wide variety of devices, but for purposes of illustration the invention has been shown more or less schematically as embodied in connection with a range burner. It is to be understood that the burner may be any other burner with which automatic timer and safety shut-olf provided by the present invention is suitable or desired.

In the cooking range adaptation of they invention, the burner |10 represents for example a typical oven burner or broiler burner. A fuel supply pipe 18 leads to the burner for delivery of gaseous or other fuel thereto. Pilot burner 12, which is located in juxtaposition to the main burner 10 to maintain the pilot llame for igniting the main burner, is supplied with gaseous fuel by a pilot supply pipe 13. Interposed in the fuel supply pipes 18 and 13 is a fuel flow control apparatus 9 which provides safety shut-olf and time control of the fluid fuel to said burners. A thermostatic range valve 11 is preferably mounted on the downstream side of the device 9 and may partake of any suitable or desired form. The reason for `disposition of the thermostatic valve on the downstream side ofthe control device 9 will appear hereinafter.

The control device 9 is essentially comprised of safety shut-olf means for both the main and pilot burner valves, timing means, setting means operable to place one of the valves under the control of the timing means and which is also operable to selectively determine the time intervals causing starting and stopping of the fuel ow through the device.

More particularly, the device 9 comprises a housing 15 having a main inlet 16 and outlet 17, the latter leading to the main burner 10 through supply pipe 1S. The housing 15 is also provided with a separate pilot supply pipe inlet 19 and outlet 19a interposed in the fuel supply line 13 for the pilot burner 12. The housing may be formed into three partitioned chambers, namely, the valve chamber 15a, control chamber 15b and motor chamber 15e.

In the valve camber 15a, interposed between the main inlet 16 and outlet 17, are a pair of spaced back to back valve seats 20 and 21 which are controlled by valve members 22 and 23 respectively. Valve member 22 is biased to a closed relation with seat 2G by a suitable coil compression spring 22a which is interposed between the casing 15 and a valve arm 24. Valve member 23 is adapted to be carried by a stem 26 which is xedly mounted on a valve arm 25. A coil compression spring 27 is interposed between the valve arm 25 and the valve member 23 to bias the latter against the head of stem 26 so as to provide a ylost motion connection between said stem and valve member. A coil compression lspring 28 is interposed between the casing 15 surrounding valve -seat 21 and valve arm 25 to bias said yarm and hence valve member 23 away from the seat 21. Thus valve member 22 is biased closed and valve member 23 is biased open. i Means forcontrolling the pilot -fuel Viow Ymay be Yinterf i posed between 4the inlet 19 and outlet `19a of the housing 15 and is here shownas a Vvalve seat 41 Vvanda valve member 42. The valve member 42 may be mounted on an elongated stem 34V which sealingly extends through a partition wall for coaction With an electromagnet V=35 as willbe later explained. A coil compression spring 43 may beinterposed between the valve member 42 and the casing 15 surrounding the inlet 179, said spring being adapted to bias the valve member 42 to the right as shown in Figure l and into engagement with the seat 41.

The valve member 22 may be called'the safety shut-oit valve, the .safety shut-off actuator therefor being disposed the control chamber 15b.- The actuator and the H`5.5953497 Y Y. A.

valve member may be connected asby the valve arm 24 Which extends to the left as viewed in Figure lk to xedly engage apshaft 30 which extends through a partition wall `15d separating the valve chamber 15a from the control chamber 15b. A pivotal armature lever arm 31 which carries an armature 32 thereon is disposed in the control chamberV 15b and ixedly mounted upon the other end of shaft 30. The armatureV lever arm 31 is iixedly mounted Von a suitable shaft for pivotal movement thereon, the Ashorter end of said lever arm 33 being adapted to be enin a clockwise direction. Arm 57 is formed with a hooked latching surface at the end thereof for latching coaction with valve lever arm 51. Arm 58, the upper arm as viewed in Figure 3, is disposedrso as to engage timing cam I64 as will be later explained.

Means for selectively placing the valve member 23 under the automatic control ofthe timing mechanism is provided by a button 60 whichis mounted on the upper extremity of shaft' 61 as viewed in Figure 3. The shaft 61 extends through a housing platerlSf, the control chamber .15b and through a partition wall 15e for engagement with the coupling 47 of the timing motor. The motor 46 may have VVa suitable clutch therein for transmitting rotary motion v'to thel shaft `61 when the latter is pressed inwardly as viewed in Figure 3. Said clutch (not shown) disengaging the timer motor and shaft when the latter is pulled outwardly. In the control chamber, mounted upon and intermediate of the ends of shaft 61, are a pair of timingY cams 63vand .64 which are adapted to coact with the latching means and -the valve meansin ia preselected time sequence. .-As-.bestviewed inl-ligure 3, the lower cam 63 is -iixedly mounted upon .shaft V61for direct coaction. with lever farmV 52Y `and hence valve member 23. The upper portion of fca`m63 is enlarged and gaged by a reset cam surface 40 and the longer other Y fand an upper eccentric cam surface 64b. Both cam surend of said armature arm extending upwardly as viewed in Figure l-for coaction with the pilot valve stem34.

'Ihe safety shut-off electromagnet 35 may be suitably mounted upon an outer wall portion of the casing 15 the control chamber 15b and comprises a core 36 having an energizing winding 37 thereon, the ends of which may be connected in circuit with a thermoelectric generator 14 through conductors 14a and 14b. The

' electromagnet 35 when energized is adaptedto hold the armature 32 and thus the pilot and main valve members 42 and 22 in cocked flow-permitting position when said parts are moved to this position against the bias of springs V43 and 22a. It is to be noted that in the embodiment shown, the electromagnet '35 has insufcient power when energized'to move or attract the armature '32 from a retracted position, but it does have sufcient power to hold or retain the parts when moved thereto by some suit- Vable outside means such as reset cam 40. Y Means for automatically controlling the fuel flow t may have formed Vthereon av suitable toothed Vclutch rsurface which is engageablewithmating grooves in the `enlarged clutch surface of the upper cam'f64. Cam '.64'is preferably formed with-a bevelled lower cam surface VV64C faces 64b and 64e are operable ltoengage lever arm 58 ina manner asrshall later be described. `Cam 64Y also may be formed with an integral tubular extension 64a 'which extendsthrough cover'pla'te 15] and terminates a manually engageable'knob 66. Y

Cain 64 and extension-64a are looselydispo'sed about the shaft 61, the clutch surface of the cam being biased into engagement `with theclutch surface of cam 63 by a 1 coiled compression spring 65 which is interposed between the burner is provided by an automatic timer motor 46 which may be of any desired type capable of causing a control valve unit to open and close at diierent times preselected by the operator. In the embodiment shown, this unit comprises a commercially available synchronous motor 46 powered by an electric source (not shown) which is capable of transmitting rotary motion at a predetermined desired speed to a coupling 47.

Valve member 23 is controlledV by the timing motor 46 and is mechanically connected thereto by suitable linking means and cam means as yshall now be described. Valve arm 25 carrying valve member 23 at one end extends to the left as shown in Figure 1 and is iixedly connected to shaft 50 at the other end. The shaft 50 extends through the partition Wall 15d between the con trol chamber 15b and the valve chamber 15a and has ixedly mounted thereon a lever 53 of the bell crank type, having axially spaced arms 51 and 52, the latterv the button 60 andthe -cam knob 66. The relative posi- .tions of cams 64 and 63 maybe varied by relative movement ofcam knob 6.6 ,and button 60 which is permitted when the clutch surface of 'cam' 63 and 64 are separated suiciently to -permit said relative movement. For example, an operator may insert his iingers underneath knob 66 and lift or pull the same outwardlyv against-the bias of spring 65. As shownV in Figure 4, this action separates the clutch surfaces of cams 63' and`64 permitting relative rotational` movement of the parts .as desired. `Knob 66 l `and button 60 may be calibrated to .indicate Athe relative position of cams 64 and 63. It is contemplated that the relative positions ofV cams 63 and 64 may also be calibrated with respect to a clock dial and Yfurther that i the timer motor 46 may be used to supplypower to a.

suitable clock works (not shown) which will also be used in conjunction with said dial.

7 A reset knob 70 isiixedly mounted on a reset shaft 71 which extends inwardly through'plate 15f'and terminates with cam 72. Cam72 is yformed with Vtwo opp'ositely disposed cam surfaces73 and 40 sothat clockwise rotation of shaft 71 as viewed inV Figure 1 causes cam 72 and hence cam surface 73 to engage valve crank arm 51 while lcam surface 40 simultaneously engages armature arm 33. Y

Operation Y The operation of the device is asfollows:

Assume the/following initial conditionsyvalve member 22 seated upon seat 20, preventing allmow of fuel to the main burner; Y,pilot valve member 42 4seating on valve seat 41 preventing AallY ow ofV fuel `to 'the pilot burner; thermoelectr'ic generator 14 deenergized and hence electromagnet 35 Ydeenergize'cl;VV and armatureY 32 spaced away from pole face 36a under the biasof spring V22e Yas shown in Figure 1.A Y.

- Aslimng jthat the 4deviceY is. set: iorlmamial .operation and the housewife wishes to have the oven burner automatically go on and shut olf at predetermined preselected later times, the housewife follows the following procedures.

First, shut-off knob 60 and starting knob 66 are rotated relative to each other in the manner shown in Figure 4, i.e., knob 66 is lifted against the bias of spring 65 separating the clutch surfaces of cams 63 and 64 to permit'relative movement as desired. Thus, the first step is to ldetermine the initial relative positions of the upper or starting cam 64b and lower or shut-0E cam 63 with respect to each other and, if desired, with respect to a clock dial (not shown). As will be more apparent later, cam surface 64b determines the starting time of the main burner 10 and cam 63 determines the shut-off time of the main burner 10. Knob 60 is then depressed so that the shaft 61 engages the timer motor through the clutch connection (not shown) so as to retain and rotate shaft 61 and cam members 63 yand 64 at a predetermined constant speed to thereby provide the time control of the device as will be explained more fully. It is to be noted that depression of knob 60 does not cause separation of the clutch surfaces of cams 63 and 64 which remain in engagement under the bias of spring 65. In this manner, both cams 63 and 64 move downwardly upon depression of knob 60. In other words, the whole assembly surrounding shaft 61 moves downwardly with the depression of button 60.

NeXt, reset knob 70 is manually rotated so as to rotate cam 72 in ya clockwise direction as shown in Figure 1, said movement causes cam surface 40 to engage armature arm 33 to position the armature 32 in engagement with the pole face 36a. The armature `arm extension 31a engages pilot valve stem 34 moving said stem to the left as viewed in Figure l to thereby position valve 42 in flow-permitting position. Valve arm 24 and valve member 22 are simultaneously moved to open position.

The clockwise rotation of the cam 72 is such that reset cam surface 73 simultaneously engages lever arm 51 moving said arm counterclockwise as shown in Figure l to thereby position valve member 23 in engagement with seat 21 during the cooking operation. Thus, the fuel ow to the main burner is interrupted while iiow of fuel to the pilot burner 12 is permitted.

After ignition of the pilot burner 12, thermocouple 14 produces a thermoelectric current which energizes electromagnet coil 37 so that the electromagnet 35 retains the armature in its attracted position against the bias of springs 43 and 22a and cam 72 may be allowed to return to :the position shown in Figure 1. The armature 32 and valve members `42 and 22 remain in the cocked owpermitting position until outage ofthe pilot burner. The indicator 39 upon the lar-mature arm 33 is lthen in a position with respect to a suitable window (not shown) to indicate to the housewife that the pilot is burning and that the safety shut-off valve 23 and pilot valve 42 are in cocked how-permitting position.

Since knob 60 was depressed causing shaft 61 to engage the drive shaft of the timing motor to start the timing sequence, cams 63 and 64 are now rotating under control of the timing motor. The initial inward movement of knob 60 caused the lower bevelled cam surface 64C of cam 64 to be moved downwardly out of engagement with latching release arm 58. At this point it might be noticed that when knob 69 is depressed for automatic timing operation, cam surface 64C which accompanies the movement has no part in the normal operation of the device. Cam surface 64e is operable to engage latching release arm 58 only during manual operation or when button 66 is lifted to get relative setting of cams 63 and 64. -Thus the aforementioned movement of valve lever arm 51 to the left as viewed in Fig. 1 by the reset cam surface 73 for flow interruption purposes during the cooking of the safety shut-oft` armature yalso moves said lever 51 into position for latching coaction with spring loaded lever arm 57 since cam surface 64e no longerl prevents the latching. Valve member 23 is thus latched in engagement with seat 21, and, no fuel can ow to the main burner after the resetting operation until release of the latching lever 57 is effected. Thermostatic valve 11 is now opened and set at the desired temperature for later -automatic operation of the oven.

As `shaft 61 rotates, the upper eccentric cam surface `64b of cam 64 rotates into engagement with bell crank lever arm 58 to .release valve lever `arm 51 from latched en` gagement with spring loaded lever arm 57. The time at which the release is effected is determined by the initial positioning of the cam 64 and hence the eccentric cani surface 64b with respect to arm 58. Release of the latching coaction of arms 57 and 51 allows valve member 23 to move to open position under the bias of spring 28 and fuel may now ow to the main burner 10 through the thermostatic valve 11. The main burner 10 then becomes ignited yby the pilot burner 12 and under control of the thermostatic valve 11. The oven remains under the control of valve 11 until lower cam 63 rotating in a clockwise direction rotates into engagement lwith valve lever 52 which -is thereby moved in 1a counterclockwise direction to directly move the valve member 23 shut yagainst the bias of spring 28, shutting off the fuel flow to the oven and thereby completing the time cycle.

To change the control back over to manual operation from the automatic operation described, the housewife pulls knob 60 outwardly which disengages shaft 61 from the timer motor `46 through the clutch (not shown) in the motor 46. Outward movement of shaft 61 moves cams 63 yand 64 lalong therewith. The axial movement of shaft 61 causes cam 63 to move outwardly and disengage valve lever yarm 52. An interlock affording positive opening of valve 23 when the device is changed from automatic to manual operation is provided by the cam surface 64C on cam 64. The frustoconical bevelled surface 64C engages lever arm 58 upon the ou-twardly movement of shaft 61 to yassure lrelease of the latching engagement of latching arm 57 and valve lever arm 51. Thus when the device is in manual operation, the flow of the fuel is under the control of the thermostatic valve 11 and the safety shut-off valve 22. v

Although a specific embodiment of the invention has been shown and described, it is-With -full awareness that many modifications thereof are possible. The invention', therefore, is not to vbe restricted except insofar as is neces'- sitated by :the prior art and by the spirit of the appended claims.

What is claimed as the invention is:

1. In combination, first and second control means each having first and second controlling positions, means biasing each of said control means toward one of said conL trolling positions, flame responsive holding means for said first control means operable to hold said first control means in one of its said controlling positions when moved thereto against its biasing means, latching -means for said second control means operable independently of said hold.- ing means to latch said second control means in one of its said controlling positions when moved thereto against its biasing means, -and reset means cooperating with both said control means and operable against the ybias of both of said biasing means to effect holding cooperation 'of said first control means with said holding means Iand to effect simultaneous latching cooperation of said secon control means with said latching means.

2. In combination, first, second and third control means each having first yand second controlling positions, means biasing each of said control means toward one of said controlling positions, holding means for bot-h said first and said third control means operable to hold each ofsaid first and third control means in one of its said controlling positions when moved thereto against its biasing means,

latching means for said second control means operable independently of said holding means -to latch said second control means iin one of its said controlling `-positions when moved thereto against its biasing means, and reset means cooperating with Aall of said control means and operable againsst the Ibias of each of said biasing means toeiect holding cooperation .of said tirstand third control means with said holding means and to eiect latching cooperation of said second control means with said latching means.

3. In combination, iirst and second control'means each havingY first Iand second controlling positions, means biasing each of said control means towardv one of said controlling positions, electroresponsive holding means for said rst control means operable when energized to hold said vfirst control means in one of its said controlling positions "when moved thereto against its baising means, mechanical latching rmeans for said second control means operable independently of said holding means to mechanically :latch said second control means'in one of its `said controlling positions when moved thereto against its biasing srneans, `and reset means cooperating with both said control means Vand operable against the lbias of both of said biasing means to eiect holding cooperation of said first control means with said holding means and to effect simultaneous mechanical llatching cooperation of said vsecondcontrolmeans with said latching means.

" f4. In combination, first :and second control means each having iirst and -second controlling positions, means biasing each of said control means toward one of said controlling positions, holding means for said iirst control means operable to hold said first control means in one of `its vsaid controlling positions when moved thereto against i-ts biasing means, latching means for said second control means operable independently of said holding means to latch said -second control means in one of its said controlling positions when moved thereto against its Ibiasing means, reset means cooperating with .both said control means and operable against the bias of both of said biasing means to effect holding cooperation of said -irst control means with said holding means and to effect latchingcooperation of said second control means with Vsaid latching means, and actuating means operatively associated with said second control means and also operable to eiect movement of said second control means against the bias of its biasing means and into latching cooperation with said latching means.

5. dn combination, first and second control means each having n'rst and second controlling positions, means biasing each of said control means toward one of said controlling positions, holding means for said iirst control means operable to hold said rst control means -in one of its said controlling positions when moved thereto against its biasing means, releasable latching means -for said second control means operable independently of said holding means to latch said second'control means in one of its said 'controlling positions when moved thereto against its biasing means, reset means cooperating with bothV said ,control means and operable-against the lbias of both of said biasing means to etect holding cooperation of said irstcontrol means -with said holding means and to eiect latching'cooperation of said -second control means with said latching means, 'and timing operator means operatively associated with said latching means and with said second control means yfor eiecting, at a preselected time, release AYof said latching means -for `disposition of said second control means in the controlling position toward which it is biased by its biasing means, said operator means also being operable, Iata preselected later time, to effect movement of said second control means against the bias 'of its -biasing means and toward .latching cooperation with said latching means.

`6. lIn combination, irst and second control means-each having first and `second controlling positions, means biasing each of said-control means toward one of said controlling positions, electroresponsive holding means for Said `irst control lmeans operable in response to a pre.- Ydetermined condition `to Ahold said rst control means in 8 Y one'of its said controlling positions when moved thereto against rits biasing means, latching means Vfor said second control means operable independently of said holding means to latch said second control means in one of its saidcontrol'ling positions when moved thereto against its biasing means, reset means cooperating with both said control'r'neans and operable against .the bias ofiboth of said biasing means to elect simultaneous holding cooperation Vof said `:first .control means with said holding means and V.toreiiect latching kcooperation of said second control means with said latching means, and manually operated means Yfor rendering said latching means inoperative to .thereby effect disposition of said second control means in the controlling position toward which it is biased by its 'biasing'means 1 7. In combination, irst and second control means each having tirst and second controlling positions, means biasing eachfof said control means toward one of said controlling positions, holdingmeans for said llirst lcontrol means operable to hold Vsaid first control means in one of its said controlling positions when moved thereto against -its biasing means, releasable latching means for said second control means operable independently of said holding means to latch said'second control means in-one of its said controlling positions when moved thereto against its biasing means, reset means cooperating Y,with both said vcontrol means kand operable against vthe bias ot both of said biasing means to etfect holding cooperation fof said yrst control means with said holding means and to `eiect latching cooperation of said second control means with said 'latching means, timing operator means operatively associated with said latching means yand with said second-control means for ,eitecting at .a preselected time, release of said latching means for disposition of said second vcontrol means in the controlling posi- Ytion toward which it -is biased by its biasing means, said operator means also being operable, at a preselected later time, to effect movement of said second control means against the bias of its biasing means .and toward latching cooperation with said latching means, and manually operated means for operatively disassoc'iating'said timing operator means from said latching means and second control means. p

8. A fuel control device comprising a control body having a fluid passage, lirst and second Vflow Acontrol means in Said passage each having open and closed positions `with respect to iluid flow through said passage, means biasing said rst 'ow control means toward closed position, flame responsive holding means for said iirst control meansV operable to Vhold said iirst control means `in open position when moved thereto against its biasing means, means biasing said second ilow control means 'toward open position, latching means for said second control -means operable independently of said holding means to latch said second control means in closed position when moved thereto against its biasing means, and reset means cooperating with both said control means and operable against :the bias of both of said biasing means to effect opening movement of said irst control means for holding cooperation thereof with said holding means and to effect simultaneous closing movement of said second control means Vfor latching cooperation thereof with said latching means. f

9. A fuel control device comprising a control body rhaving a iluid passage, iirst and second flow control means in said passage each having n`rst and second flow controlling positions, means biasing each of said ow control means toward one of said controlling positions, holding Ymeans for said iirst ilow control means operable to holdV said iirst ow control means in one of its said controlling -positions Vwhenrmoved thereto against its biasing means, timing operator-means operatively associated with the second of said owlcontrol means only and operable-at a preselected time to permit movement of said second `flow-control means to `the position toward ,Which it biased by its biasing means, said operator means also being operable at a preselected later time to effect movement of said second flow control means against the bias `of its biasing means toward another How controlling position, and reset means cooperable with said first ow control means Vand operable to effect movement of said .{irst flow control means against the bias of its biasing means and into holding cooperation with said holding means, said reset means also being operable to overcall said timing operator means and `etlect movement of said second flow control means against the bias of its biasing means toward said another ow controlling position during a resetting operation.

10. A fuel control device comprising a control body having a fluid passage, first and second valves in said passage each having open and closed positions with respect to fluid flow through said passage, means biasing said irst valve toward closed position, holding means for said rst valve means operable to hold said first valve in open position when moved thereto against its biasing means, means biasing said second valve toward open position, timing operator means operatively associated with the second of said valve only and operable at a preselected time to permit movement of said second valve toward open position, said operator means also being operable at a preselected later time to effect movement of said second valve toward closed position, and reset means cooperable with said first valve and operable to effect movement of said rst valve toward open position and into holding cooperation with said holding means, said reset means also being operable to overcall said timing operator means and etiect movement of said second valve toward closed position during a resetting operation.

1l. In combination, irst and second control means each having first and second controlling positions, means biasing each of said control means toward one of said controlling positions, holding means lfor said first control means operable to hold said first control means in one of its said controlling positions when' moved thereto against its biasing means, releasable latching means for said second control means operable independently of said holding means `to latch said second .control means in one of its said controlling positions when moved thereto against its biasing means, reset means cooperating with both said control means and operable against the bias of both of said biasing means to effect holding cooperation of said first control means with said holding means and to effect latching cooperation of said second control means with said .latching means, and timing operator means operatively :associated with said latching means and with said second control means for effecting, at a -rst preselected time interval, release of said latching means lfor disposition of said second control means in the controlling position toward which it is biased by its biasing means, said operator means also being operable, .at a second preselected later time interval, to effect movement lof said second control means against the bias of its biasing means and toward latching cooperation with said latching means, and setting means for said timing operator means movable to one position operatively disassociating said timing operator means from said latching means and second control means and movtable -to another position `operatively rassociating said operator means with said latching means and second control means, said setting means including means Ifor preselecting said iirst and second time intervals.

12. A time controlled fuel control device comprising, a control body having a liuid passage, iirst and second ow control means in said passage each having open and closed positions with respect .to fluid flow through said passage, means biasing said rst ilow control means toward closed position, holding means for said rst control means operable to hold said rst control means in open position when moved thereto against its biasing means, means biasing said second now control means .toward 10 open position, releaseab-le latching means for said second control means operable independently of said holding means to latch said second control means in closed position when moved thereto against its biasing means, reset means cooperating With both said control means and operable .against the bias of .both of said biasing means to effect holding cooperation of said first control means with said holding means and to effect latching cooperation of said second control means with said latching means, and timing operator means operatively associated with said latching means and with said second control means for effecting, at a preselected time, release of said latching means for disposition of said second control means in open position, said operator means also being operable, at a preselected later time, to effect closing movement of said second control means and latching cooperation thereof with said latching means.

13. In combination, irst, second and third control means each having first and second controlli-ng positions, means biasing each of said control means toward one of said controlling positions, holding means for both said first `and said third control means operable -to hold each of said 'first .and third control means in one of its said controlling position when moved thereto against its biasing means, latching means for said second control means operable independently of said holding means to latch said second control means in one of its said controlling positions when moved thereto against its biasing means, rest means cooperating with all of said control means and operable against the bias of each `of said biasing means; to effect holding cooperation of said iii-st and third control means with said holding means and to effect latchingI cooperation of said second control means with said latching means, Vand timing operator means operatively associated with said latching means and with said second control means and operable to effect release of said latching cooperation for disposition of said second control means in the controlling position toward which it is biased, said timing Voperator means also being operable to elect movement of said second control means against the bias of its bias-ing means and toward latching cooperation with said latching means.

14. In combination, first and second control means each having iirst and second controlling positions, means biasing each of said control means toward one of said controlling position, electro-responsive holding means tor said irst cont-rol means operable when energized Ito hold said first control means in one of its said controlling positions when moved thereto :against its biasing means, releasable mechanical latching means for said second control means comprising a pivotally mounted bell crank having an operable independently of said holding means to latch said second control means in one of its said controlling positions when moved thereto against its biasing means, reset means comprising rotatably mounted cam means cooperating with both said control means yand operable against the .bias of both of said biasing means Ito effect holding cooperation of said first control means with said holding means land to effect latching cooperation of said second control means With said latching means, and tim-ing operator means comprising motor driven cam means operatively ,associated with said latching means to effect release of said latching means for disposition of said second control means in the controlling position rtoward which it is biased by its biasing means, said `opera-tor means `also :being operatively associated with said second control means to effect movement of said second control means lagainst the lbias of its .biasing means and toward latching cooperation With said latching means.

15. 'In combination, rst and second control means each having first and second controlling positions, means biasing each of said control means toward one of said controlling positions, flame responsive holding means for said first control means operable to hold said tirst control means in one of its said controlling positions when moved thereto against its biasing means, latching means for -said second control means comprising a pivotally mounted latching-member operable independently of said holding means to latch said second control means in one of its said controlling positions when moved thereto against its biasing means, and reset means including cam means cooperating with both said control means and operable against the bias of both of said biasing means to effect holding cooperation of said first control means with said holding means and to effect simultaneous latching cooperation of said second control means with said pivotally mounted latching member. n

j 16. In combination first and second control means each having first and second controlling positions, means 'biasing' each of said control means toward one of said controlling positions, holding means for said first control means operable to hold said first control means in one of its Ysaid controlling positions when moved thereto against its biasing means, timing operator means operatively associated With the second of said control means only and operable to permit movement of said second control means to the position toward which it is biased by its biasing'means, said'operator also-being operable to effect movement of said second control means against the bias of its biasing means toward another controlling position, and reset means cooper-able with said first control means and operable to effect movement of said first control means against the bias of its biasing means and Vinto holding cooperation with said holding means, said reset means also being operable to eiiect movement of'said second control means against the bias of its biasing means toward said another controlling position during a resetting operation.

17. A fuel control device comprising first and second control means each having first and second controlling positions, means biasing each of said control means to'- ward one of said controlling positions, holding means responsive to the heat of burning fuel for holding said iirst control means in one of its said controlling positions when moved thereto against its biasing means, timing operator means operatively associated with the second of said control means only and operable to permit movement of said second control means to the position toward which it is biased by its biasing means, said operator means also being operable to effect movement of said second control means against the bias of its biasing means toward another controlling position, and reset means cooperable with said rst ow control means and operable to effect movement of said first flow control means against the bias sof its biasingfmeans and into 'holding cooperation Ywith said holding means, said reset means also being operable to effect disposition of said second flow control means in-its said another flow controlling position irrespective of the operation of saidY timingoperator Vmeans during a'resetting' operation.

18.' A fuel control device for main and pilot burners comprising a control'body having -a iiuid passage, first and second ow control means in said passage each having first and second Vilow controlling positions Vfor control of fuel flow to one of said burners, means biasing said first flow control means toward its rst controlling position, holding means for said first ow control Vmeans operable in response to the heat of burning fuel at the other of vsaid burners to hold said first iiow control means in its said second controlling position when moved thereto against its biasing-means,'means biasingsaid second ow control means toward its said second controlling position, timing operator Vmeans operatively associated with the second Yof said ow control means only and operable at a preselected time to eiect disposition of said second flow control means in its said second position, said operator means also -being operable at a preselected later time to effect movement ofV said Second flow control means against the bias of its biasing means toward its said first controlling position, and reset means cooperable with both said flow control means Aand operable to effect movement of said firsty ow control means against the lbias of its biasing means toward'its said second controlling position and'into vholding cooperation with said holding means, said reset means also being operable to overcall said timing operator means and effect movement of said second flow control means against thebias of its biasing means toward its Said rst flow controlling-position during a resetting operation.

References Cited in the filerof this patent UNITED STATES PATENTS K -Fonseca Jan. 30, 1934 

